I've finally got to change a timing belt on a JK diesel - and in reality was surprised that it wasn't half black magic ( considering how much of a PITA I thought it would be ). If you've never done one before then allow around seven hours if you keep at it - obviously a dealer would probably be around five(ish).
No special tools required, anyone with the usual sockets, open enders and assorted other small hand tools will be fine. Only "special" tool is a largish shifter to remove the fan boss and a paint pen to mark the sprockets.
Removing the fan(s) and shroud takes the most time but once its out its reasonably straightforward if your carefull. Believe it or not the washer bottle removal is almost the biggest pita
Obviously maintaining the sprocket relationships is ESSENTIAL but i can confirm that the special service tools aren't required if your carefull and mark everything before removing the old belt. Setting the belt tension is also simple once you've figured out how the tension indicator actually works.
As your not using the camshaft locking tool you don't need to replace the sealing bung on the front of the exhaust camshaft.
You don't loose any oil or water but its worth washing out the radiator whilst the shroud is off - the crap that comes out is a "bit" depressing.
So if you want to save $$$ and are mechanically competent there's no reason why you shouldn't do the cam belt yourself. However if you'ver never fitted a cam belt to anyting before then probably not a job for you OR get a mate who has - to help.
P.S. the replacement cam belt came from Double Black Offroad.